These API is provided as is, and does not come with any binary compatibility promise. Install on top of your corresponding SDK (or SDK target in the Qt SDK) if the files are not already provided there.

Files are taken from Nokia N97 SDK v1.0
Should be copied to the appropriate Symbian SDK folder in QtSDK path. For example to C:\QtSDK\Symbian\SDKs\Symbian1Qt473\

Here are hswidgetpublisher and aknswallpaperutils libraries.
Only hswidgetpublisher is really needed for hs widgets.